When inserting a component in Revit, you select the family that you want to use in the...

In Revit, when you want to insert a component, you use the type selector to choose the specific type of family you plan to place. The type selector is a dropdown menu located in the properties bar that allows you to quickly pick from the pre-loaded types of a selected family once you have activated the command to place a component. This interface is designed to streamline the process of selecting among different variations of a component, which can include different sizes, styles, or configurations of the same family.

The component library, while it does contain families, is more about the overall collection of available components rather than the specific selection at the moment of placement. The properties palette provides details about the selected component or element but does not serve as the selection tool for inserting components. The project browser lists all the components and views in your project but does not facilitate the immediate selection of component types for placement. Therefore, the type selector is the correct answer, as it directly allows users to choose the family type they wish to insert into the project.